Miner&#39;s pick.



PATENTED MAR. 7, 1905.

HARDSOGG. MINERS PICK APPLICATION FILED MAY 22, 1903 UNITED STATES Patented March '7', 1905.

MARTIN HARDSOCG, or OTTUMWA, IOWA MINERS PICK.

SPECIFICATION forming part of Letters Patent No. 784,044, dated March '7, 1905. Application filed May 22, 1903. Serial No. 158,252.

To (LZZ 1071,0721 it may concern.-

Be it known that LMARTIN Hnnnsooma citizen of the United States of America, and a resident of Ottumwa, VVapello county, Iowa, have invented a new and useful Miners Pick, of which the following is a specification.

The object of this invention is to provide an improved construction for miners picks and holders therefor. whereby picks may be removed and replaced readily relative to the holder and beheld firmly whilemounted therein.

My invention consists in the construction,ar rangement, and combination of elements hcre inafter set forth. pointed out in my claims. and illustrated by the accompanying drawings, in which- Figure 1 is a yiew of acomplete device en1- bodying my invention. Fig. 2 is a view, partly in section, illustrating my invention. Fig. 3 is a cross-section of the device on the indicated line 3 3 of Fig. 2. Fig. 1 is a perspective detail of the locking means detached from the other elements of the device. Fig. 5 is a detail view of modified means for operating the wedge-blocks.

In the construction of the device as shown the numeral designates a stem or socket formed with a transverse cavity, recess, or passage 11 in one end portion. The end portion of the stem 10 opposite the recessed portion 11 is bifurcated and hollow to receive and be titted to a handle 12, the arms 13 11 of the bifurcation embracing one end portion of the handle and bolted thereto, whereby said arms may lit varying sizes of handle and be tightened thereto as said handle shrinks or wears in use. The end portions 15 16 of the outer cross-bar or end 17 of the stem 10 project slightly within the recess 11 and normally enter grooves or notches in the outer face of the central portion of a pick '18, illustrated in Fig. 2. oppositely inclined wedge-blocks 19 20 are mounted in the recess 11 at the rear of the pick 18, the straight faces of the blocks contacting the pick and stem, respectively, and the inclined faces of the blocks contacting mutually. A pin 19 on the block 19 extends through a slot 10 in the stem 10 to retain the block 19 when the pick 18 is removed. Notches 21 22 are formed in the inner faces of the wedge-blocks 19 20, and the face-walls of said notches are approximately parallel with each other and formed with racks 23 21. A pinion 25, formed with a central aperture 26, angular in cross-section,is mounted for rotation in hearings or holes in the stem 10and extends across the notches 21 L2 in the wedge-blocks 19 20 in engagement with the racks 2?, 24-. The pinion 25 may be rotated by the introduction of a point of another pick in the apertureZB and manual twist ing of the said other pick, aml when so rotated in one direction the pinion will loosen the binding and wcdging effect of the wedge-blocks and permit the removal or insertion of the pick 18 by endwise movement relative to the recess 11, the teeth of the pinion and racks being relatively long to provide for proper engagement thereof when the blocks are loosened. \Vhen a pick '18 has been mounted in the recess 11, the inturned projections 15 16 engaging notches of the pick, as shown in Fig. 2, the pinion may be rotated to cause the wedge-blocks to expand within the rear portion of the recess and bind one of their number tirmly against the rear face of the pick, thus rigidly seating said pick in contact with said projections and preventing accidental loosening or removal thereof from the stem.

1n the device as shown in Fig. 5 the blocks 1?)20 are formed with notches 21 L2 and a rack 23, and a pin 19 is mounted in the block 19. A. worm 25 in the notches 21 22 engages the rack 23, and the stem of said worm extends outward longitmlinally of and through the block 20 and is formed with an angular recess 26 to receive a pick-point for rotation of the worm and consequent actuation of the block it) longitmlil'ially ol' the block 20 in either direction.

1 claim as my invcntion 1. The tool, comprising the stem formed with a recess, the pick formed with grooves on one face and mounted in said recess, projections on the stem seated in said grooves of the pick, and wedge-blocks mounted in the stem, one of the blocks contacting the pick and the other the stem, the wedge-blocks formed with oppositely-inclined faces in mutual contact and arranged for opposite rectilinear movement For expansion against said pick and stem respectively.

2. The combination of the stem, the pick therein, the wedge-blocks in said stein, one of the blocks contacting the pick, the wedgeblocks formed with oppositely-inclined faces h in mutual contact and notchedin their central portions, racks formed in the notches, and a pinion journaled in the stern and extending across the notches of the Wedge-blocks in engagement with the racks thereon, said pinion formed with a central angular aperture.

3. The stem formed with a recess and bifurcated below said recess, a pick in the recess, a pair of coacting Wedge-blocks in the recess below the pick, one block engaging the pick and the other the stern, said blocks formed with notches and racks in thenotches and contacting with each other on inclined faces, a pinion formed with trunnions on opposite ends and mounted in the notches of the wedgeblocks, the teeth of the pinion engaging said racks on the blocks, the trunnions journaled 

